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1.
Being ridiculously sexy and sweet without any effort. A girl with Larissa syndrome is unaware of her condition. Having this condition may cause many men to approach her.
Guy 1: Damn! you see that girl with Larissa Syndrome?
Guy 2: Hell yeah definitely wifey material.
by fghjkdbnn April 01, 2009
 
2.
An ailment in which, when a female is in a relationship, and her significant other has a close female friend, she becomes enraged and assumes that they are having a torrid affair any time the male and female friend see each other.
Though Tom and Charity were merely walking to the store to buy some chips, Tom's girlfriend threatened to end the relationship if he didn't turn around and run back home without Charity. Charity thought to herself that surely, Tom's girlfriend had a serious case of Larissa Syndrome.
by Pseudonymmm November 15, 2007